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Investments in Unconsolidated Joint Ventures (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Depreciable Basis In Years   40 years  
Equity of certain joint ventures   less than zero  
Country Club Plaza [Member]      
Schedule of Equity Method Investments [Line Items]      
Joint Venture Acquisition, Interest Acquired   50.00%  
Equity Method Investment, Ownership Percentage   50.00% 0.00%
Fair Oaks [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   50.00% 50.00%
International Plaza [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   50.10% 50.10%
The Mall at Millenia [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   50.00% 50.00%
Stamford Town Center [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   50.00% 50.00%
Sunvalley [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   50.00% 50.00%
The Mall at University Town Center [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   50.00% 50.00%
Waterside Shops [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   50.00% 50.00%
Westfarms [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   79.00% 79.00%
CityOn.Xi'an [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage   30.00%  
CityOn.Xi'an [Member] | Subsequent Event [Member]      
Schedule of Equity Method Investments [Line Items]      
Joint Venture Acquisition, Interest Acquired 40.00%    
Equity Method Investment, Ownership Percentage 50.00%